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Titan

Well you can't actually move all of your internal storage to the card, as your OS and other stuff will stay on the the actual internal storage. That said, you can (on some devices) make the SD card also act as internal storage and then run apps from it. It requires more than just formatting the card though. The instructions are below...

First, you need to be using a phone that is running at least Android "Marshmallow" (or newer) or be able to upgrade to it. Second, you will need the instructions I am including below. And third, you need a phone that has not been restricted by the manufacturer from making this change. Which does happen.

NOTE: If any of the steps are missing on your phone, or they don't work for you, then you have a phone that either has an older Android version or has been restricted by the manufacturer.

How to turn the "External" SD card into "Internal" storage on "Marshmallow" a.k.a. 6.0.

NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).

NOTE: If you don't reboot the phone, many things may not work correctly, so make sure you do.

How to turn the "External" SD card into "Internal" storage on "Nougat" a.k.a. 7.0.

IMPORTANT NOTE: Be sure you start with a blank SD card. When the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device), so anything on it prior would be gone.

1. Go to "Settings", and then select "Storage & USB".
2. At the bottom of the list you should see the SD card's details, including the option to format it and make it "Internal" storage.
3. Once this is done, reboot the device and you can start running things from the card.

If you don't reboot the phone, some things may not work correctly, so make sure you do the reboot.

Your solution would be wonderful, just that my Huawei Y6 II doesn't have that menu options.

webworkings :

Well you can't actually move all of your internal storage to the card, as your OS and other stuff will stay on the the actual internal storage. That said, you can (on some devices) make the SD card also act as internal storage and then run apps from it. It requires more than just formatting the card though. The instructions are below...

First, you need to be using a phone that is running at least Android "Marshmallow" (or newer) or be able to upgrade to it. Second, you will need the instructions I am including below. And third, you need a phone that has not been restricted by the manufacturer from making this change. Which does happen.

NOTE: If any of the steps are missing on your phone, or they don't work for you, then you have a phone that either has an older Android version or has been restricted by the manufacturer.

How to turn the "External" SD card into "Internal" storage on "Marshmallow" a.k.a. 6.0.

NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).

NOTE: If you don't reboot the phone, many things may not work correctly, so make sure you do.

How to turn the "External" SD card into "Internal" storage on "Nougat" a.k.a. 7.0.

IMPORTANT NOTE: Be sure you start with a blank SD card. When the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device), so anything on it prior would be gone.

1. Go to "Settings", and then select "Storage & USB".
2. At the bottom of the list you should see the SD card's details, including the option to format it and make it "Internal" storage.
3. Once this is done, reboot the device and you can start running things from the card.

If you don't reboot the phone, some things may not work correctly, so make sure you do the reboot.

Titan

Alas, as it says in the instructions, if the device doesn't have any of the steps, then the manufacturer has probably restricted this option on the device. Nothing you can really do about that one. Not without say rooting the device, which is not something I would ever recommend as it is to easy to brick the device.